Comparison of Post-Polymerization Microhardness Values for a Representative Bulk Fill Composite Placed Using Room-Temperature and Preheated Placement Regimens
Abstract
ABSTRACT: Purpose: The objective of this study is to see if the preheating of bulk fill resin composite increases its microhardness physical properties compared to room temperature bulk fill resin composite. Methods: Two Groups of Filtek(trademark) One Bulk Fill Composite were evaluated: one at room temperature and another preheated in a BioClear HeatSync Composite Warmer Kit to 155 deg. F. The composites were then injected into fifteen 4.5 mm discs and cured for 20 seconds. The discs were placed on an Instron LM300 AT tester and using a Knoop hardness test evaluated at 4 separate points on the top and bottom of the discs. The data was analyzed and reviewed for statistical analysis. Results: Examination of the overall Knoop Hardness Number (KHN) of the two groups showed significant effects of temperature on microhardness. The overall average of the room temperature had a mean hardness of 29.1 KHN compared to an overall hardness of 34.4 KHN with bulk fill composite at heated temperature. In both groups, the top side of the cure was significantly harder than the bottom side of cure. Conclusions: Preheating Filtek One Bulk Fill composite shows an increase in microhardness after polymerization.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 14, 2019
- Accession Number
- AD1127798
Entities
People
- Jonathan D. Caso
Organizations
- Uniformed Services University of the Health Sciences